Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...387..712l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 387, March 10, 1992, p. 712-714. Research supported by NSF.
Astronomy and Astrophysics
Astrophysics
70
Background Noise, Frequency Measurement, Solar Oscillations, Accuracy, Helioseismology, Maximum Likelihood Estimates, Signal To Noise Ratios
Scientific paper
If one assumes that solar p- and f-mode oscillations are stochastically excited, then the measured mode properties and solar background noise can be used to calculate maximum-likelihood uncertainties in mode frequency measurements for a given observation time. It should be possible with a 3-yr continuous observation to measure individual mode frequencies to accuracies as high as a factor of about 5 times better than current best one-season measurements. The most precise measurements should be for low-l modes in the 1-2 mHz range, and the longest periods observable in a 3-yr observation will be approximately 20 minutes. These fundamental limitations in the eventual accuracy of p-mode frequency measurements are set by the solar background noise and the stochastic nature of the driving mechanism.
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